I have one for Hayden and the difference for him has been huge! We got it after he had 4 teeth, we got it right around the time he turned one, next time I'll buy one much earlier. But before he would get super fussy, have a bit of a fever, in obvious pain, barely slept the nights before they broke through. After we got it we seriously didn't know he was getting teeth in until we saw them in his mouth! It has helped him so much, no more fussing, fever, nothing..the only thing he still does is sometimes chews on his finger or something, like right now he's working on his 2yr molars and he'll chew on his finger back there, but that's it.